Buildyourstartupindays.
Share, iterate and start earning faster.

A working web app you copy and make your own. It already has the parts every product needs — people can sign up and log in, their data is stored and kept private, the screens look right, and it's ready to put online. You delete the example bits and build your idea on top. The industry word for this is a starter kit or boilerplate; the plain version is that someone already did the first week for you.

You need to be comfortable copying commands and following a setup guide — the sort of thing plenty of people now do alongside an AI coding tool. You do not need to know how any of it works underneath. If you have never opened a code editor and don't intend to, this is not the right thing for you, and we would rather say so than sell you something you'll fight.

Because the week it saves you is not the expensive week. The expensive one is the month after, spent building carefully for nobody. Every kit on the market makes you faster at building; being faster at building the wrong thing is not a saving. So this one shortens the other half of the loop too.

Everyone else using this. Everyone here took the same kit, has a half-finished product, and wants the same thing you do — which is why it works as a trade rather than a favour. They can give useful feedback because they are building the same kind of thing and hit the same walls last month.

Testing someone else's is what earns you a round on yours, so the more you give the sooner it comes back — rounds are matched here rather than left to whoever happens to be around. And every round asks the same six questions, so when answers land they line up side by side instead of arriving as six unrelated write-ups you have to read twice.

Sign-ups and logins by emailed code, so there are no passwords to reset. Taking payment, wired up and tested. Email that arrives in the inbox rather than the spam folder. A database set up so people only ever see their own data. A set of screens and components you own outright, and a checklist that tracks what you can actually prove about your idea. Underneath it's Next.js, Supabase, Stripe, Resend, Tailwind and TypeScript — all ordinary, popular choices you'd probably have made anyway. The testing happens on Dayzero rather than in the code: you submit your product here, get matched with another builder, and the answers come back to you here too.

You get access to a private GitHub repository. When your place in the cohort comes up we ask for your GitHub username and add you to it — then you clone it like any other project and it is on your machine. There is nothing to download, no licence key, and no account of ours you have to keep paying for to keep the code working.

Nothing, if you are in the beta cohort: the codebase and the Dayzero community, free, and yours to keep afterwards whatever happens. At launch it becomes a one-off $177 — not a subscription, no seats and no licence key, so buying it once covers every project you start after that.

We want the feedback. You get the codebase and the community for nothing, and in exchange we will ask what broke, what confused you, and what was missing. You can ignore us and you still keep the code — there is no clawback, because the moment you have the repository there is no way to un-give it. The cohort is small precisely so we can act on what comes back.

Two people, building in the open, and using it for our own work — which is the real answer to whether it gets maintained. Every fix we need, you get. We put Dayzero through the same testing rounds you will, so if something is rough you have a direct line to the people who can change it.